erefore not
long-lived. Now this is precisely the result which often occurs in
domestic animals, where a highly cultivated race is bred with one that
is of ruder character and training; and it very probably results from
the circumstance that the progeny may inherit too much of the delicacy
of the one parent to endure the hardships congenial to the other; or,
on the other hand, too much of the wild nature of the ruder parent to
subsist under the more delicate nurture of the more cultivated. This
difficulty does not apply to the intermixture of the Negro and the
European, though between the pure races this is a cross too abrupt to
be likely to be in the first instance successful.

6. The races of man may have originated in the same manner with the
breeds of our domesticated animals. There are many facts which render
it probable that they did originate in this way. Take color, for
instance. The fair varieties of man occur only in the northern
temperate zone, and chiefly in the equable climates of that zone. In
extreme climates, even when cold, dusky and yellow colors appear. The
black and blackish-brown colors are confined to the inter-tropical
regions, and appear in such portions of all the great races of mankind
as have been long domiciled there. Diet and degree of exposure have
also evidently very much to do with form, stature, and color. The
deer-eating Chippewayan of certain districts of North America is a
better developed man than his compatriots who subsist principally on
rabbits and such meaner fare; and excess of carbonaceous food, and
deficiency of perspiration or of combustion in the lungs, appear
everywhere to darken the skin.[173] The Negro type in its extreme form
is peculiar to low and humid river valleys of tropical Africa. In
Australasia similar characters appear in men of a very different race
in similar circumstances. The Mongolian type reappears in South
Africa. The Esquimau is like the Fuegian. The American Indian, both of
South and North America, resembles the Mongol; but in several of the
middle regions of the American continent men appear who approximate to
the Malay. Everywhere and in all races coarse features and deviations
from the oval form of skull are observed in rude populations. Where
men have sunk into a child-like simplicity, the elongated forms
prevail. Where they have become carnivorous, aggressive, and actively
barbarous, the brachy-kephalic forms abound. These and many other
considera